/* ---------------------------------------------------------------------------
   TurboGuitar landing — tobacco-sunburst stage, nickel strings, one sheet of
   paper where the score lives. Product imagery is real app captures.
--------------------------------------------------------------------------- */

:root {
  --lacquer:   #16100A;   /* page: warm brown-black, nitro lacquer */
  --lacquer-2: #1D1509;   /* raised panels */
  --burst:     #E8A33D;   /* amber stage light / playhead */
  --burst-hot: #F5BE63;
  --tobacco:   #7A4A1F;
  --paper:     #F4EDDD;   /* score paper — used only where scores live */
  --ink:       #241B10;   /* ink on paper */
  --text:      #EDE4D4;
  --muted:     #A99C87;
  --nickel:    #9AA0A8;   /* string steel — staff lines, quiet details */
  --line:      rgba(237, 228, 212, 0.09);

  --radius-card: 12px;
  --font-display: "Bricolage Grotesque", "Avenir Next", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--lacquer);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { width: min(1120px, 92vw); margin: 0 auto; }

a { color: inherit; }
p a { color: var(--burst-hot); text-decoration-color: rgba(232, 163, 61, 0.4); }
p a:hover { text-decoration-color: var(--burst-hot); }

code, kbd, pre { font-family: var(--font-mono); }
kbd {
  font-size: 0.85em;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.1em 0.4em;
  background: var(--lacquer-2);
}

img { max-width: 100%; }

:focus-visible { outline: 2px solid var(--burst); outline-offset: 3px; border-radius: 4px; }

/* --- nav ------------------------------------------------------------- */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(22, 16, 10, 0.78);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap; padding: 0.8rem 0;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-display); font-weight: 800; font-size: 1.05rem;
  text-decoration: none; letter-spacing: -0.01em;
}
.brand svg { border-radius: 6px; }
.nav-links { display: flex; gap: 1.6rem; }
.nav-links a {
  font-size: 0.85rem; color: var(--muted); text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }

/* --- hero ------------------------------------------------------------ */

.hero {
  position: relative;
  padding: clamp(4.5rem, 9vw, 7.5rem) 0 clamp(3rem, 6vw, 4.5rem);
  overflow: hidden;
  background:
    radial-gradient(1100px 640px at 28% -12%, rgba(232, 163, 61, 0.26), transparent 62%),
    radial-gradient(900px 560px at 78% 4%, rgba(122, 74, 31, 0.30), transparent 60%),
    var(--lacquer);
  border-bottom: 1px solid var(--line);
}
/* faint lacquer grain */
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero .container { position: relative; z-index: 1; }

.eyebrow {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--burst);
  margin-bottom: 1.1rem;
}
.beta {
  display: inline-block; margin-left: 0.5em; padding: 0.05em 0.55em;
  border: 1px solid rgba(232, 163, 61, 0.5); border-radius: 999px;
  color: var(--burst-hot); letter-spacing: 0.08em;
}

.hero h1 {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(2.9rem, 7.5vw, 5.4rem);
  line-height: 0.98; letter-spacing: -0.025em;
  margin-bottom: 1.4rem;
}
.hero h1 em { font-style: normal; color: var(--burst); }

.lede {
  max-width: 36em; color: var(--muted); font-size: 1.1rem;
  margin-bottom: 2rem;
}
.lede code { font-size: 0.9em; color: var(--text); }

.cta-row { display: flex; gap: 0.9rem; flex-wrap: wrap; }

.btn {
  display: inline-block; text-decoration: none; border-radius: 999px;
  font-weight: 600; font-size: 0.95rem; padding: 0.75em 1.5em;
  transition: transform 0.15s, background 0.15s, border-color 0.15s;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--burst); color: var(--ink);
  box-shadow: 0 4px 24px rgba(232, 163, 61, 0.25);
}
.btn-primary:hover { background: var(--burst-hot); }
.btn-ghost { border: 1px solid rgba(237, 228, 212, 0.25); color: var(--text); }
.btn-ghost:hover { border-color: rgba(237, 228, 212, 0.55); }

/* --- the stage: playable tab ----------------------------------------- */

.stage {
  display: flex; align-items: center; gap: 1.3rem;
  margin-top: clamp(2.6rem, 5vw, 4rem);
  padding: clamp(1.1rem, 2.5vw, 1.7rem) clamp(1.1rem, 2.8vw, 1.9rem);
  background: linear-gradient(180deg, rgba(237, 228, 212, 0.045), rgba(237, 228, 212, 0.015));
  border: 1px solid var(--line);
  border-radius: 16px;
}
.play-btn {
  flex: none; width: 58px; height: 58px; border-radius: 50%;
  border: none; cursor: pointer;
  background: var(--burst); color: var(--ink);
  box-shadow: 0 6px 30px rgba(232, 163, 61, 0.35);
  display: grid; place-items: center;
  transition: transform 0.15s, background 0.15s;
}
.play-btn:hover { background: var(--burst-hot); transform: scale(1.05); }
.play-btn:active { transform: scale(0.96); }
.play-btn svg { width: 26px; height: 26px; fill: var(--ink); }
.play-btn .ic-stop { display: none; }
.play-btn.playing .ic-play { display: none; }
.play-btn.playing .ic-stop { display: block; }

.staff-scroll { flex: 1; min-width: 0; overflow-x: auto; }
.staff { display: block; width: 100%; min-width: 620px; height: auto; }

/* hero staff: nickel strings on lacquer */
.staff--hero .staff-line { stroke: rgba(154, 160, 168, 0.42); stroke-width: 1.2; }
.staff--hero .bar-line   { stroke: rgba(154, 160, 168, 0.55); stroke-width: 1.6; }
.staff--hero .tuning     { fill: rgba(154, 160, 168, 0.6); }
.staff--hero .fret       { fill: #C8BCA6; }
.staff--hero .fret.lit   { fill: var(--burst-hot); }
.staff--hero .fret.played{ fill: #8E8471; }
.staff--hero .cursor {
  stroke: var(--burst); stroke-width: 3; stroke-linecap: round;
  filter: drop-shadow(0 0 7px rgba(232, 163, 61, 0.8));
}

.fret {
  font-family: var(--font-mono); font-size: 21px; font-weight: 500;
  text-anchor: middle;
}
@media (prefers-reduced-motion: no-preference) {
  .fret { transition: fill 0.12s; }
  .fret.lit {
    transform: scale(1.25);
    transform-box: fill-box; transform-origin: center;
  }
  .staff-anim .string-group {
    transform: scaleX(0); transform-box: view-box; transform-origin: left center;
    animation: string-in 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
  }
  .staff-anim .fret { opacity: 0; animation: fret-in 0.5s ease forwards; }
  @keyframes string-in { to { transform: scaleX(1); } }
  @keyframes fret-in   { to { opacity: 1; } }
}
.tuning { font-family: var(--font-mono); font-size: 14px; text-anchor: middle; }

.stage-hint {
  margin: 0.9rem 0 0 0.3rem;
  font-size: 0.85rem; color: var(--muted);
}

.formats {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
  margin-top: clamp(2.2rem, 4vw, 3rem);
  padding-top: 1.6rem; border-top: 1px solid var(--line);
}
.formats-label {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--muted); margin-right: 0.4rem;
}
.chip {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text);
  border: 1px solid var(--line); border-radius: 999px; padding: 0.2em 0.75em;
  background: rgba(237, 228, 212, 0.03);
}
.chip-amber { border-color: rgba(232, 163, 61, 0.5); color: var(--burst-hot); }

/* --- sections ---------------------------------------------------------- */

.section { padding: clamp(4rem, 9vw, 7rem) 0; }
.section-line { border-top: 1px solid var(--line); }

.section h2 {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  line-height: 1.05; letter-spacing: -0.02em;
  margin-bottom: 1.2rem;
}
.section-lede { max-width: 34em; color: var(--muted); margin-bottom: 1rem; }
.footnote { font-size: 0.85rem; color: var(--muted); max-width: 42em; }

/* --- the app, for real ------------------------------------------------- */

.shot { margin: clamp(2.2rem, 5vw, 3.4rem) auto 0; max-width: 980px; }
.shot img {
  display: block; width: 100%; height: auto;
  border-radius: var(--radius-card);
  border: 1px solid rgba(237, 228, 212, 0.15);
  background: #1E1E1E;   /* window chrome tone behind the rounded corners */
  box-shadow:
    0 24px 48px rgba(0, 0, 0, 0.5),
    0 80px 160px rgba(0, 0, 0, 0.35),
    0 0 120px rgba(232, 163, 61, 0.07);
}
.shot figcaption {
  margin-top: 1rem; text-align: center;
  font-family: var(--font-mono); font-size: 0.75rem;
  letter-spacing: 0.04em; color: var(--muted);
}

/* --- feature list ------------------------------------------------------ */

.features {
  list-style: none;
  display: grid; grid-template-columns: repeat(3, 1fr);
  column-gap: 2.5rem;
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
}
.features li {
  border-top: 1px solid var(--line);
  padding: 1.15rem 0 1.5rem;
  color: var(--muted); font-size: 0.95rem;
}
.features code {
  display: block; margin-bottom: 0.5rem;
  color: var(--burst-hot); font-size: 0.8rem; letter-spacing: 0.02em;
}

/* --- pdf pipeline ------------------------------------------------------ */

.pipeline {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 2.2rem; margin: clamp(2rem, 5vw, 3rem) 0 1.6rem;
}
.step-n {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--burst);
  display: inline-block; margin-bottom: 0.8rem;
  border: 1px solid rgba(232, 163, 61, 0.45); border-radius: 999px;
  width: 1.9em; height: 1.9em; line-height: 1.8em; text-align: center;
}
.step h3 {
  font-family: var(--font-display); font-weight: 700; font-size: 1.15rem;
  margin: 1rem 0 0.4rem; letter-spacing: -0.01em;
}
.step p { color: var(--muted); font-size: 0.92rem; }

.card { border-radius: var(--radius-card); }
.card img { display: block; width: 100%; height: auto; }
.mini-label {
  display: block; margin: 1px 2px 9px;
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.12em;
  text-transform: uppercase; color: rgba(36, 27, 16, 0.55);
}
.card-paper {
  background: var(--paper); color: var(--ink);
  padding: 12px 12px 14px;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.38);
}
.erase-wrap { position: relative; }
.erase {
  position: absolute; left: 1%; right: 1%; top: 57%; height: 38%;
  background: rgba(244, 237, 221, 0.93);
  border: 1px dashed rgba(176, 84, 30, 0.6); border-radius: 4px;
  display: grid; place-items: center;
}
.erase span {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.12em;
  text-transform: uppercase; color: #B0541E;
}
.card-dark {
  background: var(--lacquer-2);
  border: 1px solid rgba(232, 163, 61, 0.3);
  padding: 11px 11px 13px;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.38);
}
.card-dark .mini-label { color: rgba(237, 228, 212, 0.5); }
.card-dark img { border-radius: 5px; }

/* --- lean / download ---------------------------------------------------- */

.lean {
  display: grid; grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem); margin-top: 1.6rem;
}
.lean-copy, .lean-build { min-width: 0; } /* let the <pre> scroll, not the page */
.lean-copy p { color: var(--muted); max-width: 34em; }
.arch {
  margin-top: 1.4rem; padding: 1.1rem 1.3rem;
  background: var(--lacquer-2); border: 1px solid var(--line); border-radius: 10px;
  font-size: 0.82rem; line-height: 1.7; overflow-x: auto;
  color: var(--text);
}
.lean-build {
  align-self: start;
  background: var(--lacquer-2);
  border: 1px solid var(--line); border-radius: 14px;
  padding: 1.6rem 1.7rem 1.7rem;
}
.lean-build h3 {
  font-family: var(--font-display); font-weight: 700; font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.lean-build .footnote { margin: 0.7rem 0 1.3rem; }
.lean-build .btn + .footnote { margin: 1.1rem 0 0; }

/* --- footer ------------------------------------------------------------ */

.footer {
  border-top: 1px solid var(--line);
  padding: clamp(3rem, 6vw, 4.5rem) 0;
  background:
    radial-gradient(900px 400px at 50% 130%, rgba(232, 163, 61, 0.12), transparent 65%),
    var(--lacquer);
}
.motto {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.2rem, 2.6vw, 1.6rem); letter-spacing: -0.01em;
  margin-bottom: 0.9rem;
}
.meta { font-size: 0.82rem; color: var(--muted); }
.meta a { color: var(--muted); }
.meta a:hover { color: var(--text); }

/* --- reveal on scroll --------------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
  .reveal.in { opacity: 1; transform: none; }
}

/* --- responsive --------------------------------------------------------- */

@media (max-width: 900px) {
  .pipeline { grid-template-columns: 1fr; max-width: 480px; }
  .features { grid-template-columns: 1fr 1fr; }
  .lean { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  h1 br, .section h2 br { display: none; }
  .features { grid-template-columns: 1fr; }
  .features li { padding: 1rem 0 1.2rem; }
  .stage { gap: 0.9rem; padding: 0.9rem 1rem; }
  .play-btn { width: 48px; height: 48px; }
  .stage-hint { margin-left: 0; }
}